Working on this problem and one of my classmates tried substituting x and y in terms on (z,theta) and once solved 1=1. Does that prove that it is a ruled surface?
Thank you
Hey topsaa.
Can you show us what you tried (and how you got 1=1)?
One hint that I can think of is to take the line equation, break up the functions and square all elements and try re-arrange them to show that you get x^2 + y^2 - z^2 = 1 which proves that the line lies on the surface.